Computer aided design and analysis of the sprue system of an injection mould for optical data storage replication

摘要

The present work offers 3D CAD models of two basic types of the sprue system of an optical disc mould that are developed. The first type of the sprue system is known as a system, in which the central hole of the polymer substrate is formed by breaking off the circle gate from the polymer substrate In the other type of the sprue system the central hole of the polymer substrate is formed by direct punching of the gate from the polymer substrate The gate depth and the gate position are defined as variable parameters and combined with different variants of the processing conditions in mould filling simulation. A range of improved variants of all the variable parameters is obtained with the help of iterative steps within the frame of the simulation code. A modified gate system is proposed in the process of research, which allows a gate with a lager depth parameter to be used. The modified system allows also alteration of the gate position with respect to the central hole. The best results are achieved, using the proposed modified gate system in the case, when the gate position is located symmetrically towards the central hole.